Public Declare Function WideCharToMultiByte Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long, ByRef lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpDefaultChar As String, ByVal lpUsedDefaultChar As Long) As Long Public Declare Function MultiByteToWideChar Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, ByRef lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long) As Long Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (lpvDest As Any, lpvSource As Any, ByVal cbCopy As Long)
Public Const CP_UTF8 = 65001
'Purpose:Convert Utf8 to Unicode Public Function UTF8_Decode(ByVal sUTF8 As String) As String
Dim lngUtf8Size As Long Dim strBuffer As String Dim lngBufferSize As Long Dim lngResult As Long Dim bytUtf8() As Byte Dim n As Long
If LenB(sUTF8) = 0 Then Exit Function
If m_bIsNt Then On Error GoTo EndFunction bytUtf8 = StrConv(sUTF8, vbFromUnicode) lngUtf8Size = UBound(bytUtf8) + 1 On Error GoTo 0 'Set buffer for longest possible string i.e. each byte is 'ANSI, thus 1 unicode(2 bytes)for every utf-8 character. lngBufferSize = lngUtf8Size * 2 strBuffer = String$(lngBufferSize, vbNullChar) 'Translate using code page 65001(UTF-8) lngResult = MultiByteToWideChar(CP_UTF8, 0, bytUtf8(0), _ lngUtf8Size, StrPtr(strBuffer), lngBufferSize) 'Trim result to actual length If lngResult Then UTF8_Decode = Left$(strBuffer, lngResult) End If Else Dim i As Long Dim TopIndex As Long Dim TwoBytes(1) As Byte Dim ThreeBytes(2) As Byte Dim AByte As Byte Dim TStr As String Dim BArray() As Byte
'Resume on error in case someone inputs text with accents 'that should have been encoded as UTF-8 On Error Resume Next
TopIndex = Len(sUTF8) ' Number of bytes equal TopIndex+1 If TopIndex = 0 Then Exit Function ' get out if there's nothing to convert BArray = StrConv(sUTF8, vbFromUnicode) i = 0 ' Initialise pointer TopIndex = TopIndex - 1 ' Iterate through the Byte Array Do While i <= TopIndex AByte = BArray(i) If AByte < &H80 Then ' Normal ANSI character - use it as is TStr = TStr & Chr$(AByte): i = i + 1 ' Increment byte array index ElseIf AByte >= &HE0 Then 'was = &HE1 Then ' Start of 3 byte UTF-8 group for a character ' Copy 3 byte to ThreeBytes ThreeBytes(0) = BArray(i): i = i + 1 ThreeBytes(1) = BArray(i): i = i + 1 ThreeBytes(2) = BArray(i): i = i + 1 ' Convert Byte array to UTF-16 then Unicode TStr = TStr & ChrW$((ThreeBytes(0) And &HF) * &H1000 + (ThreeBytes(1) And &H3F) * &H40 + (ThreeBytes(2) And &H3F)) ElseIf (AByte >= &HC2) And (AByte <= &HDB) Then ' Start of 2 byte UTF-8 group for a character TwoBytes(0) = BArray(i): i = i + 1 TwoBytes(1) = BArray(i): i = i + 1 ' Convert Byte array to UTF-16 then Unicode TStr = TStr & ChrW$((TwoBytes(0) And &H1F) * &H40 + (TwoBytes(1) And &H3F)) Else ' Normal ANSI character - use it as is TStr = TStr & Chr$(AByte): i = i + 1 ' Increment byte array index End If Loop UTF8_Decode = TStr ' Return the resultant string Erase BArray End If
EndFunction:
End Function
'Purpose:Convert Unicode string to UTF-8. Public Function UTF8_Encode(ByVal strUnicode As String, Optional ByVal bHTML As Boolean = True) As String Dim i As Long Dim TLen As Long Dim lPtr As Long Dim UTF16 As Long Dim UTF8_EncodeLong As String
TLen = Len(strUnicode) If TLen = 0 Then Exit Function
If m_bIsNt Then Dim lngBufferSize As Long Dim lngResult As Long Dim bytUtf8() As Byte 'Set buffer for longest possible string. lngBufferSize = TLen * 3 + 1 ReDim bytUtf8(lngBufferSize - 1) 'Translate using code page 65001(UTF-8). lngResult = WideCharToMultiByte(CP_UTF8, 0, StrPtr(strUnicode), _ TLen, bytUtf8(0), lngBufferSize, vbNullString, 0) 'Trim result to actual length. If lngResult Then lngResult = lngResult - 1 ReDim Preserve bytUtf8(lngResult) 'CopyMemory StrPtr(UTF8_Encode), bytUtf8(0&), lngResult UTF8_Encode = StrConv(bytUtf8, vbUnicode) ' For i = 0 To lngResult ' UTF8_Encode = UTF8_Encode & Chr$(bytUtf8(i)) ' Next End If Else For i = 1 To TLen ' Get UTF-16 value of Unicode character lPtr = StrPtr(strUnicode) + ((i - 1) * 2) CopyMemory UTF16, ByVal lPtr, 2 'Convert to UTF-8 If UTF16 < &H80 Then ' 1 UTF-8 byte UTF8_EncodeLong = Chr$(UTF16) ElseIf UTF16 < &H800 Then ' 2 UTF-8 bytes UTF8_EncodeLong = Chr$(&H80 + (UTF16 And &H3F)) ' Least Significant 6 bits UTF16 = UTF16 \ &H40 ' Shift right 6 bits UTF8_EncodeLong = Chr$(&HC0 + (UTF16 And &H1F)) & UTF8_EncodeLong ' Use 5 remaining bits Else ' 3 UTF-8 bytes UTF8_EncodeLong = Chr$(&H80 + (UTF16 And &H3F)) ' Least Significant 6 bits UTF16 = UTF16 \ &H40 ' Shift right 6 bits UTF8_EncodeLong = Chr$(&H80 + (UTF16 And &H3F)) & UTF8_EncodeLong ' Use next 6 bits UTF16 = UTF16 \ &H40 ' Shift right 6 bits UTF8_EncodeLong = Chr$(&HE0 + (UTF16 And &HF)) & UTF8_EncodeLong ' Use 4 remaining bits End If UTF8_Encode = UTF8_Encode & UTF8_EncodeLong Next End If If bHTML Then UTF8_Encode = Replace$(UTF8_Encode, vbCrLf, "<br/>") End If End Function
to liu_binq63(liubin): 并且有一部分字符不能转换。 1.bytUtf8 = StrConv(sUTF8, vbFromUnicode)用CopyMemory,不要用StrConv 2.你的XP应当装你所要转换的字符的字体。（Control Panel-->Install East Asia Characters ,最好安装包括阿拉伯字符集。）
Public Declare Function MultiByteToWideChar Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, ByRef lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long) As Long
Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (lpvDest As Any, lpvSource As Any, ByVal cbCopy As Long)
Public Const CP_UTF8 = 65001
'Purpose:Convert Utf8 to Unicode
Public Function UTF8_Decode(ByVal sUTF8 As String) As String
Dim lngUtf8Size As Long
Dim strBuffer As String
Dim lngBufferSize As Long
Dim lngResult As Long
Dim bytUtf8() As Byte
Dim n As Long
If LenB(sUTF8) = 0 Then Exit Function
If m_bIsNt Then
On Error GoTo EndFunction
bytUtf8 = StrConv(sUTF8, vbFromUnicode)
lngUtf8Size = UBound(bytUtf8) + 1
On Error GoTo 0
'Set buffer for longest possible string i.e. each byte is
'ANSI, thus 1 unicode(2 bytes)for every utf-8 character.
lngBufferSize = lngUtf8Size * 2
strBuffer = String$(lngBufferSize, vbNullChar)
'Translate using code page 65001(UTF-8)
lngResult = MultiByteToWideChar(CP_UTF8, 0, bytUtf8(0), _
lngUtf8Size, StrPtr(strBuffer), lngBufferSize)
'Trim result to actual length
If lngResult Then
UTF8_Decode = Left$(strBuffer, lngResult)
End If
Else
Dim i As Long
Dim TopIndex As Long
Dim TwoBytes(1) As Byte
Dim ThreeBytes(2) As Byte
Dim AByte As Byte
Dim TStr As String
Dim BArray() As Byte
'Resume on error in case someone inputs text with accents
'that should have been encoded as UTF-8
On Error Resume Next
TopIndex = Len(sUTF8) ' Number of bytes equal TopIndex+1
If TopIndex = 0 Then Exit Function ' get out if there's nothing to convert
BArray = StrConv(sUTF8, vbFromUnicode)
i = 0 ' Initialise pointer
TopIndex = TopIndex - 1
' Iterate through the Byte Array
Do While i <= TopIndex
AByte = BArray(i)
If AByte < &H80 Then
' Normal ANSI character - use it as is
TStr = TStr & Chr$(AByte): i = i + 1 ' Increment byte array index
ElseIf AByte >= &HE0 Then 'was = &HE1 Then
' Start of 3 byte UTF-8 group for a character
' Copy 3 byte to ThreeBytes
ThreeBytes(0) = BArray(i): i = i + 1
ThreeBytes(1) = BArray(i): i = i + 1
ThreeBytes(2) = BArray(i): i = i + 1
' Convert Byte array to UTF-16 then Unicode
TStr = TStr & ChrW$((ThreeBytes(0) And &HF) * &H1000 + (ThreeBytes(1) And &H3F) * &H40 + (ThreeBytes(2) And &H3F))
ElseIf (AByte >= &HC2) And (AByte <= &HDB) Then
' Start of 2 byte UTF-8 group for a character
TwoBytes(0) = BArray(i): i = i + 1
TwoBytes(1) = BArray(i): i = i + 1
' Convert Byte array to UTF-16 then Unicode
TStr = TStr & ChrW$((TwoBytes(0) And &H1F) * &H40 + (TwoBytes(1) And &H3F))
Else
' Normal ANSI character - use it as is
TStr = TStr & Chr$(AByte): i = i + 1 ' Increment byte array index
End If
Loop
UTF8_Decode = TStr ' Return the resultant string
Erase BArray
End If
EndFunction:
End Function
'Purpose:Convert Unicode string to UTF-8.
Public Function UTF8_Encode(ByVal strUnicode As String, Optional ByVal bHTML As Boolean = True) As String
Dim i As Long
Dim TLen As Long
Dim lPtr As Long
Dim UTF16 As Long
Dim UTF8_EncodeLong As String
TLen = Len(strUnicode)
If TLen = 0 Then Exit Function
If m_bIsNt Then
Dim lngBufferSize As Long
Dim lngResult As Long
Dim bytUtf8() As Byte
'Set buffer for longest possible string.
lngBufferSize = TLen * 3 + 1
ReDim bytUtf8(lngBufferSize - 1)
'Translate using code page 65001(UTF-8).
lngResult = WideCharToMultiByte(CP_UTF8, 0, StrPtr(strUnicode), _
TLen, bytUtf8(0), lngBufferSize, vbNullString, 0)
'Trim result to actual length.
If lngResult Then
lngResult = lngResult - 1
ReDim Preserve bytUtf8(lngResult)
'CopyMemory StrPtr(UTF8_Encode), bytUtf8(0&), lngResult
UTF8_Encode = StrConv(bytUtf8, vbUnicode)
' For i = 0 To lngResult
' UTF8_Encode = UTF8_Encode & Chr$(bytUtf8(i))
' Next
End If
Else
For i = 1 To TLen
' Get UTF-16 value of Unicode character
lPtr = StrPtr(strUnicode) + ((i - 1) * 2)
CopyMemory UTF16, ByVal lPtr, 2
'Convert to UTF-8
If UTF16 < &H80 Then ' 1 UTF-8 byte
UTF8_EncodeLong = Chr$(UTF16)
ElseIf UTF16 < &H800 Then ' 2 UTF-8 bytes
UTF8_EncodeLong = Chr$(&H80 + (UTF16 And &H3F)) ' Least Significant 6 bits
UTF16 = UTF16 \ &H40 ' Shift right 6 bits
UTF8_EncodeLong = Chr$(&HC0 + (UTF16 And &H1F)) & UTF8_EncodeLong ' Use 5 remaining bits
Else ' 3 UTF-8 bytes
UTF8_EncodeLong = Chr$(&H80 + (UTF16 And &H3F)) ' Least Significant 6 bits
UTF16 = UTF16 \ &H40 ' Shift right 6 bits
UTF8_EncodeLong = Chr$(&H80 + (UTF16 And &H3F)) & UTF8_EncodeLong ' Use next 6 bits
UTF16 = UTF16 \ &H40 ' Shift right 6 bits
UTF8_EncodeLong = Chr$(&HE0 + (UTF16 And &HF)) & UTF8_EncodeLong ' Use 4 remaining bits
End If
UTF8_Encode = UTF8_Encode & UTF8_EncodeLong
Next
End If
If bHTML Then
UTF8_Encode = Replace$(UTF8_Encode, vbCrLf, "<br/>")
End If
End Function
我也找到这两个函数了，效率太低。
并且有一部分字符不能转换。
1.bytUtf8 = StrConv(sUTF8, vbFromUnicode)用CopyMemory,不要用StrConv
2.你的XP应当装你所要转换的字符的字体。（Control Panel-->Install East Asia Characters
,最好安装包括阿拉伯字符集。）